Process of scoring metal



'H. A. HOLZ AND F. P. FAHY. PROCESS OF SCORING METAL.

APPLICATION FILED MAR. 21, 191B. '1,333,3ll@

Patented Mar. 9, 1920.

'lil'li lTEfi til? i r "r HERMAN A, HOLE Alli) FRANK P. FAHY, GE 313W YORK, Y.; SAID 3331 TS SAIT HOLE PROCESS, OF SGOR-ING METAL.

Z. :17 Z Il 10m it may concern Be it known that we, linens A. l'lOLZ and .l niann I. finnr, citizens of the United v the art to which it uppcrtziius to make and use the same.

111 a pending application for Unite: States patent filed by Herman A. Holz, on March 16th, 1918, hearing Serial Number 222,93 l, there is described and claimed a method of marking, scoring or cutting metals by the frictional action of a rapidly moving smooth metal surface, the eflect of Which is pro gressively to fuse particles of the metal to he cut along; the line of severance and to carry awaythc particles as fast us they are thus fused. The advantages of the process in question are set forth in said pending application for patent. The tool employed in this process is of such :1 nature and is so employed that each element upon the active;

surface is brought back to the point ol action periodically and a period of inactivity is thus provided during which such element is cooled by its rapid movement through the air. While a rotating disk is used in this connection, it is not indispensably necessary that the tool should have that form. Fun thermore, it is not essential that the disk or other tool. should be made in one piece having an active edge, since, if desired, the active edge may be attached to a body per.- tion of a, material not in itself suited to carrying out the process in question. This active edge is smooth and is applied to the metal to be scored or severed with light pressure.

Cur invention relates to an improvement upon this process wherein the metal acted upon is S1ll3]GG'i-fi(l to auxiliary heating from any suitsble source,'such as a gas flame or electric current, during; the operation. By this expedient the heart of fusion is not created exclusively by the frictional action of the tool, and in some cases this frictional action may be soreduced us to 'accomplish little more than the carrying away of the fused particles. As the severing or scoring tool is in contactwith the pessive'meteri'el Specification of Letters Patent.

the passive material.

Application filed March 21, 1918. Serial No. 223,720.

only at a small surface, said. tool will not be unduly heated, and during the time that any given element is not at such point of contact it will be cooled by its rapid movement through the air. 1

It will be obvious that, by thus applying auxiliary heat directly to the point ol action of the tool We may either lessen the time re quired for accomplishing given amountoit work. orwc can accomplish the same amount of work in the sums time with Pss eel-penditure or energy in the tool. already stated, it will be within the scope oi"; the in Yention to make the tool :10 clusively to remove the fused gerticles the auxiliary heat being relied upon to eceonn plish the fusion.

Any source of heat uiuy employed within the scope of the invention, but We prefer in most cases to employ electric cur by producing an imperfect contact at the 1 point to be heated. This imperfect contactweproduce by cruising the rapidly moving tool to exert a relatively ligl We ei'er for this purpose, to useuiteriniting current of low voltage and high amperage but it is of course, within the scope of our invention to use (lirect'current for the purpose set forth.-

It will be seen that by this use of a suitable heating current in combination Wit 1 smooth tool movingvery rapidly in the main ner mentioned, We are enublcd to secure at very eiiicicnt scoring: or se ering action with :1 small exertion of energy in the tool used.

The uc'conufmnying drawing is'u diegrznu: inatic representation of one form of zippers tus whereby our improved process may he carried out.-

Here the friction Wheel Ill) (driven by eny convenient means not shown) is applied to the cutting of a piece of metal ll. The she'i t 12 of the wheel is provided with u collecting a suhrtcntielly pressure upon low tension coil 160i the transformer arev connected respectively to the ring 13 and the metal 11. lhe current of large volume thus an auxiliary heating agency locally to the chat of contact, until-the temperature procuced is sufiicient to c use iusionofpessi've material which is thereupon carried progressively by said. moving surface.

2. The process set forth ill'l filiklnl 1, Wherein the auxiliary heating is prorlucecl by an.

electric current passing across the point of applied to the Work. becomes the auxiliary heating agent.

Our invention is specific form. of tool used-and relates to the process of sive material is subjected.

What We claim isl. The process of marking s ering metallic materiel which consists in subjecting the some to the frictional action of a rapidly moving surface While; applying solely quite independent of the treatment to which the pas.

contact between the tool and the passive meterial.

The process set forth in. claim 1, where 1n the elements of the moving suriace are caused to return periodically to the point of oring or sev- I motion and are cooled during their periods of inaction.

In testimony whereoi we e'lliii our tui'es. 

